Device for even spreading of water onto a running web, particularly a cellulosic pulp web



y 1962 B. SCHIBBYE 3,032,100

DEVICE FOR EVEN SPREADING OF WATER ONTO A RUNNING WEB, PARTICULARLY ACELLULOSIC PULP WEB Filed Dec. 29, 1959 2 Sheets-Sheet l y 1,1962 B.SCHIBBYE 3,032,100

DEVICE FOR EVEN SPREADING OF WATER ONTO A RUNNING WEB, PARTICULARLY ACELLULOSIC PULP WEB Filed Dec. 29, 1959 2 Sheets-Sheet 2 DEVICE FOR EVENSPREADING OF WATER ONTO A RUNNING WEB, PARTICULARLY A CELLU- LOSIC PULPWEB Lauritz Benedictus Schibbye, Langgatan 19, Sundsvali, Sweden FiledDec. 29, 1959, Ser. No. 862,528 Claims priority, application Sweden Dec.31, 1958 4 Claims. (Cl. 162--308) Particularly in the cellulose industrythere is a need for spreading Water evenly onto a running web, e.g. inorder to supply warm water to a paper web being formed on the wire of aFourdrinier paper machine or in order to supply wash water to a pulp webcarried on the surface of a rotary sieve drum. It is essential that thewater is supplied as carefully as possible in order to avoid unevennessof the web and it is an object of the invention to be able to vary theamount of the water supplied while maintaining the even distributionthereof over the entire width of the web.

The present invention relates to a device for even spreading of wateronto a running web, particularly a cellulosic pulp web on a rotary sievedrum, in which device the water is spread in the shape of an even thinfilm and in which the above-mentioned object of being able to vary thewater quantity supplied, is fulfilled. In such a device which comprisesa casing extending across the web and having at its bottom one or morerows of ejection apertures outside of which an essentially horizontalguide plate for the ejected Water is arranged, said object is obtainedessentially by the provision within the casing and in cooperation withthe ejection apertures, of a memher having corresponding apertures andbeing displaceable in such a manner that the ejection apertures can beshut off to a desired extent in order to control the water quantityejected.

Two preferred embodiments of the device according to the invention areshown in the accompanying drawings. FIG. 1 shows a front elevationalview of a first embodiment, taken in a direction opposite to the flowdirection of the water. FIG. 2 is a side elevational and crosssectionalview taken along the line IIII in FIG. 1. FIG. 3 shows a part of FIG. 2on an enlarged scale. FIG. 4 is a side elevational and cross-sectionalview of a second embodiment of the device according to the invention.

The Water spreading device shown in FIGS. 1 to 3 comprises acomparatively narrow and deep casing 11 having vertical side walls and ahorizontal bottom. When, as is assumed here, the device should be usedfor the spreading of water onto a pulp layer carried upon the surface ofa foraminous sieve drum of a rotary cellulose filter, said casing isplaced above the cylindrical sieve drum 13, FIG. 2, of the filter, thelength direction of the casing being parallel to the shaft of the sievedrum. The casing 11 extends along the entire axial'length of the sievedrum in order to spread water over the whole width of the pulp web. Afilter cloth 15 taking up a major part of the space of the casing issuspended between two frames 17 and 19, of which the former 17 restsupon ribs 21 attached to the inside of the casing, whereas the other 19is freely suspended. The filter cloth 15 also has a horizontal bottompart held by the frame 19 and therefore forms a bag closed at thebottom. Water is supplied to the casing through two tubes 23, 25attached to the upper longitudinal edges of the casing and beingprovided with spray apertures 27 evenly distributed over the length ofthe tubes. Provided in one end wall of the casing is a square opening,the lower edge 29 of which forms an overflow and to which a drainpassage 31 is connected.

States Patent The bottom of the casing 11 merges along one of its longerside walls, into a guide plate 33 which near the casing is horizontaland farther away forms a shallow cylindrically rounded ridge 35 thehighest point of which is situated at a somewhat higher level than thehorizontal part of the guide plate. Attached to the upper side of saidguide plate is a great number of vertically extending, substantiallyparallel guide vanes 37 which are positioned at right angles to theguide plate 33 as well as to the front wall of the casing 11. The vanes37 are partly covered by a horizontal lid 39 located close to the wallof the casing and having its outer edge slitted and the tongues thusformed bent down between the vanes 37. Thus, there is formed between theparts 39, 41 and 33 a closed chamber 43 from which water can bedischarged merely by passing below the tongues 41. From there by meansof the vanes the water is guided away from the casing 11 at squareangles to the same and drops over the outer edge of the ridge as a thincontinuous film.

The water is supplied to said chamber by a horizontal row of ejectionapertures 45 provided in the lower part of the front wall of the casing.Displaceably guided by means of ribs 47, 49 along the inner side of thecasing is a slide member 51 carrying a plate 53. Said plate is held inengagement with the part of the wall of the casing in which theapertures 45 are located, and the plate is provided with apertures whichin a certain position of the slide 51 coincide with the apertures 45 sothat the latter are left fully open. The slide 51 is displaceable bymeans of an adjustment screw 57 and by actuation thereof the apertures55 can be displaced so that they more or less cover the apertures 45. Insaid manner the quantity of water spread over the sieve drum can easilybe controlled. The quantity of water supplied through the tubes 23, 25which gets superflows when the ejection apertures 45 are wholly orpartly covered, is discharged through the drain passage 31. A very evendistribution of the water in the axial direction of the sieve drum 13 isobtained by the resistance offeredto the water flow when passing thefilter cloth 15, the apertures 45 and the passage below the tongues 41.Possible cross-currents are eliminated by the guide vanes 37.

The embodiment according to FIG. 4 is composed of three units, each oneof which essentially corresponds to the design shown in FIGS. 1 to 3.Said units are built together in a step-like arrangement. A drainpassage 31 is required merely for the lowermost unit, whereas the waterlevel of the upper units is determined by the overflow edges 55 and 57.

Ofcourse, the embodiments above described may be modified as to theirdetails. Thus, ejection apertures may be arranged, in addition to theapertures 45 in the side wall or instead thereof, in the bottom of thecasing, and the apertures may be arranged in several parallel rows or insome other pattern. The apertures 45 and 55 may be circular or made asnarrow slits.

I claim:

1. A device for evenly spreading water in the form of a thin film onto arunning celluosic pulp web carried by a rotary sieve drum or the like,comprising: casing means extending across the web and having at leastone row of bottom ejection apertures; control means cooperativelymounted with said casing means having corresponding apertures forcooperation with said first-mentioned ejection apertures, said controlmeans being displaceable along said casing means with respect to saidejection apertures to control the quantity of water ejected; andgenerally horizontal guide plate means mounted adjacent said ejectionapertures to control the path of the water leaving said casing meansfrom said apertures.

2. A device for evenly spreading water in the form of a thin film onto arunning cellulosic pulp web carried by a rotary sieve drum or the like,comprising: casing means extending across the Web and having at leastone row of bottom ejection apertures; and generally horizontal guideplate means mounted adjacent said ejection apertures to control the pathof water leaving said casing means from said apertures, said guide platemeans including a plurality or" generally parallel guide vanes arrangedtherealong in closely spaced relationship to control the direction offlow of the Water leaving said apertures.

3. A device for evenly spreading Water in the form of a thin film onto arunning cellulosic pulp web carried by a rotary sieve drum or the like,comprising: casing means extending across the Web and having at leastone row of bottom ejection apertures; water inlet means communieatingwith said casing means; a sieve cloth disposed in References Cited inthe file of this patent UNITED STATES PATENTS 2,673,763 Dunn Mar. 30,1954 2,784,558 Hohnstein Mar. 12, 1957 2,864,406 Schewel Dec. 16, 1958

